Sanding head



QP 1940. w. H. ILIILL ET AL 2,215,151

SANDING HEAD Filed July 27} 1959 2 Sheets-Sheet 1 Attorneys PatentedSept. 17, 1940 PATENT OFFICE 2,215,151 SANDING HEAD William H. Hill andnation Clyde Hall, Bassett, Va.

Application July 27, 1939, Serial No. 286,920

2 Claims.

Our invention relates to abrasive implements and more particularly toimprovements in sanding heads of the rotary multiple flap type.

The invention is designed with the particular purpose in view ofproviding a device of this type equipped for the storage therein ofreplenishing supplies for a plurality of sanding flaps readilyaccessible from the outside of the head for replenishing purposes andwhich is inexpensive to lo manufacture, reliable and eflicient inoperation, and adapted for easy attachment to a power driven shaft.'

To the accomplishment of the above, and subordinate objects presentlyappearing, a preferred l embodiment of the invention has beenillustrated in the accompanying drawings, set forth in detail in thesucceeding description, and defined in the claims appended hereto.

In said drawings Figure 1 is a view in side elevation of the preferredembodiment of the invention with the cover plate removed,

Figure 2 is a View in side elevation looking at the reverse sideof thedevice,

35 Figure 3 is a view in transverse section taken on the line 33 ofFigure 1 looking in the direction indicated by the arrows,

Figure 4 is a view in top plan,

Figure 5 is a view in side elevation of one of 30 the roll holders, and

Figure 6 is a fragmentary view in transverse section taken on the line66 of Figure 1 looking in the direction indicated by the arrows.

Describing the invention in detail, with reference to the drawings bynumerals, the basic element of the sanding head is a cylindrical casingl of suitable metal open at one side and having a closed opposite side2, and an axial inwardly extending hub 3 integral with the closed side2. 40 The casing l is adapted to be closed by a circular cover plate 4of the same diameter as said casing and which is provided with an axialbore 5 therein of the same diameter as the bore 6 of the hub 3. Thecasing l and cover plate are de- 45 signed to be mounted on one end of asuitable power driven mandrel, represented by dotted lines at 1 inFigure 1, and fixed thereto by means of a nut on the outer end of saidmandrel, represented by dotted lines at 8, said nut clamping the 50cover plate 4 against the side edge of the casing. Preferably the coverplate 4 is grooved, as at 9, and the side edge of the casing l isbeveled, as at IQ, for interfitting relation to form a dustproof sealbetween said plate and casing.

55 Extending inwardly from the closed side 2 of said casing I is aplurality of pivot studs H disposed parallel with the axis of the casingand arranged in equidistantly spaced apart relation in a circularseries, concentric to said axis, said studs being contiguous to theinner circumferen- 5 tial wall of the casing and terminating short ofthe cover plate 4. The studs II have reduced inner ends, as at 12,extended through the closed side 2 of the casing I and upset, as at I3,to anchor the same to said side.

A plurality of cylindrical roll holders 14 are pivotally mounted at oneside thereof on said studs II, respectively, parallel axially with saidstuds and for outward swinging movement in M said casing I under theaction'of centrifugal '15 force, said holders trailing the studs underrotation'of the casing I in one direction, i. e,, clockwise as indicatedby the arrows in Figure 1. Preferably, for mounting the holders M on thestuds ll, each holder is provided with an ex- 20 terior radial boss l5,extending along one side thereof and apertured, as at Hi, to fit overthe related stud II. The holders M are each diametrically split toprovide, in what constitutes the outer side thereof, a narrowlongitudinally extending slot l1.

The casing l is provided in the circumferential wall thereof with aplurality of transversely extending equidistantly spaced slots l8extending from the closed side 2 parallel with the axis of the casingand opening onto the side edge of the casing at the open side of thelatter. There are the same number of slots l8 as there are holders l4and said slots l8 are arranged in said casing in circumferentiallyoffset, rearward relation to the slots ll of the holders M, as regardsthe direction of rotation of the casing I, so that the slots I8 trailthe slots I? under rotation of said casing in the direction indicatedand for a purpose presently seen.

In the use and operation of the invention, the cover plate 4 beingtemporarily removed, the holders 14 are loaded with rolls, as at I9, offlexible, abrasive material, paper, or cloth, and the outer ends 20 ofsaid rolls are extended out of 4 the casing I by way of the slots ll ofthe holders !4 and the slots l8 in the casing l to provide free flaps,as at 2|, said flaps being passed from the holders l4 through theadjacent slots I8 in the casing. Under rotation of the casing l theholders M are thrown outwardly onv the studs ll whereby the flaps 2| areflexed, or bent, by the sides of the slots IT, as at 22, andfrictionally gripped by the edges of the slots I1 in a manner such thata friction lock is formed between the holders and flaps preventing therolls I 9 from paying off the abrasive material and thereby maintainingselected lengths of flaps. As the holders l4 move outwardly, the flaps2| are similarly gripped by the sides of the slots [8 thereby forming afriction lock between the flaps and the casing l as will be clear. Whenthe cylinder I is stationary, the flaps 2| may be torn off and replacedby other lengths pulled from the rolls [9, the holders l4 swinging underthe pull exerted on the material to break the friction locks describedand permit the material to be easily pulled from the rolls IS.

The flaps 2| may be used to whip an article being sanded, or, backed bythe casing as will be understood.

The foregoing will, it is believed, suffice to impart a clearunderstanding of the invention without further explanation.

Manifestly the invention, as described, is susceptible of modificationwithout departing from the inventive concept and right is hereinreserved to such modifications as fall within the scope of the subjoinedclaims.

What we claim is:

1. A centrifugal sanding head for rotation by a mandrel comprising acylindrical casing having 1 open and closed sides, respectively, and aplurality of transversely extending slots therein equidistantly spacedapart circumferentially thereof, a disk-like cover plate for the openside of the casing, said plate and the closed side of the casing beingaxially bored for mounting on said mandrel and a plurality ofcylindrical roll holders for rolls of abrasive sheet materialcorresponding in number to said slots and pivotally mounted in saidcasing parallel with said slots in opposed relation to the same,respectively, said holders being slotted longitudinally, respectively,opposite the slots of said casing for the extension of said sheetmaterial from the holders through the slots thereof and the opposedslots in the casing to form free abrasive flaps outside said casing,said holders being swingable outwardly on the pivots thereof under theaction of centrifugal force whereby said material is pulled I tautagainst the side edges of the slots to frictionally lock the same tosaid holders and case mg.

2. A centrifugal sanding head for rotation by a mandrel comprising acylindrical casing having open and closed sides, respectively, and aplurality of transversely extending slots therein equidistantly spacedapart circumferentially thereof, a disk-like cover plate for the openside of the casing, said plate and the closed side of the casing beingaxially bored for mounting on said mandrel, and a plurality ofcylindrical roll holders for rolls of abrasive sheet materialcorresponding in number to said slots and pivotally mounted in saidcasing parallel with said slots in opposed relation to the same,respectively, said holders being slotted longitudinally, respectively,opposite the slots of said casing for the extension of said sheetmaterial from the holders through the slots thereof and the opposedslots in the casing to form free abrasive flaps outside said casing,said holders being swingable outwardly on the pivots thereof under theaction of centrifugal force whereby said material is pulled taut againstthe side edges of the slots to frictionally lock the same to saidholders and casing, and said holders being staggered circumferentiallyrelative to the slots in the casing to facilitate frictionally lockingthe material to said side edges of the slots.

H. CLYDE HALL.

WILLIAM H. I-l'ILL.

